Restore Your Vehicle’s Electrical System with a Hassle-Free Solution
Are you battling bizarre electrical gremlins in your Buick Enclave or another GM vehicle? Flickering lights, malfunctioning power windows, a temperamental security system, or dashboard warnings that come and go are classic signs of a failing Body Control Module (BCM). As the central computer for your vehicle’s comfort and convenience features, a faulty BCM can make driving frustrating and unpredictable. This isn’t just an annoyance; it can affect vehicle security and safety systems. This listing offers a reliable and straightforward solution: a replacement BCM featuring our expert Cloning Service.
A Technician’s Notebook: The Case of the Haunted Enclave
I remember a 2011 Enclave that came into my shop with a list of symptoms that sounded like a ghost story. The radio would change stations on its own, the interior lights would pulse dimly at night, and the liftgate would occasionally refuse to open. The owner had already replaced the battery and checked all the fuses. A scan showed a slew of communication error codes, primarily U0140 (Lost Communication With Body Control Module). Instead of just throwing a new, unprogrammed BCM at it—which would have required hours of setup at the dealer—we opted for a cloned unit. By transferring the original data, we created a plug-and-play replacement. The install took less than an hour, and every single electrical gremlin vanished. This is the power of a proper cloning service—it’s a precise, efficient repair.
What is a BCM Cloning Service?
Our cloning service is the key to a simple, effective repair. Instead of sending you a blank module that requires expensive dealership programming, we transfer the critical data from your original BCM directly onto this replacement unit. This includes your vehicle’s unique VIN, security information for your keys, and other vehicle-specific settings. The result is a module that is 100% plug-and-play. Your vehicle will recognize it as the original, saving you hundreds of dollars and the headache of a trip to the dealer. After your purchase, you will send us your original BCM. We perform the cloning service and ship both your original module and the ready-to-install replacement back to you.
Common Signs of a Failing BCM
- ✔ Erratic or non-functional interior and exterior lights.
- ✔ Power windows, locks, or mirrors working intermittently or not at all.
- ✔ Horn sounding unexpectedly or not working when pressed.
- ✔ Vehicle security system issues, including false alarms or starter disablement.
- ✔ Inconsistent or failed operation of the heating and A/C blower motor.
- ✔ Diagnostic trouble codes (DTCs) related to communication errors, such as U0140, U0155, or other U-codes.
- ✔ ‘Service Theft System’ or similar messages on the instrument cluster.
A Straightforward Guide to BCM Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- ✔ Locate the BCM: On the 2008-2012 Enclave (and similar platforms like the Acadia and Traverse), the BCM is typically located on the left (driver’s) side of the dashboard, often behind the lower trim panel near the steering column.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that must be depressed to release. Once disconnected, unbolt or unclip the module from its mounting bracket.
- ✔ Install the New Module: Mount the new, cloned BCM in the same position as the old one. Securely reconnect all electrical connectors, ensuring they click into place.
- ✔ Reconnect Power: Reattach the negative battery terminal and tighten it securely.
- ✔ Test Functionality: Start the vehicle and test all body-related functions—lights, locks, windows, radio, etc.—to confirm the repair was successful.
Important Post-Installation Information
While our cloning service makes this a plug-and-play part, some GM vehicles may require a ‘re-sync’ procedure for specific systems after the BCM is replaced. Please be aware of the following possibilities:
- Airbag System Sync: If the airbag warning light is on after installation, a ‘Setup SDM Primary Key in BCM’ procedure may be needed. This requires a professional-grade scan tool to sync the airbag system with the new BCM.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration might be necessary to ensure correct brake light and traction control operation.
Verified Vehicle Compatibility
This BCM, part number 20921436, is a direct replacement for a wide range of original equipment part numbers and fits many GM vehicles. Always match your part number or confirm fitment with your VIN. Compatible part numbers include: 10382479, 15093910, 15276271, 15299986, 15819552, 15828601, 15837419, 15872388, 15872421, 15880684, 15921352, 15921353, 15948438, 15948439, 20815898, 20839063, 20864767, 20864768, 20921435, 20921436, 20935349, 22860591, 25826124, 25826125, 25847588, 25847589, 25892622, 25910474, 25934762, 25934763, 95151084.
This part fits many models including, but not limited to:
- 2008-2012 Buick Enclave
- 2007-2012 GMC Acadia
- 2009-2012 Chevrolet Traverse
- 2006-2013 Chevrolet Impala
- 2007-2009 Chevrolet Equinox
- 2008-2012 Chevrolet & GMC Full-Size Vans (Express/Savana)
- 2010 Chevrolet Tahoe, Suburban & Avalanche
- 2010 Cadillac Escalade, ESV, EXT
- …and many others listed in the fitment data.
Frequently Asked Questions
What exactly is a ‘Cloning Service’?
Cloning is a process where we transfer the complete software and vehicle-specific data (like the VIN and key codes) from your original BCM to the replacement unit. This makes the new part an exact digital copy of the old one, eliminating the need for dealership programming.
Will my keys and remote fobs work immediately after installation?
Yes. Because we clone your original module’s security data, your existing keys and remotes will work just as they did before, with no relearning procedure required.
Do I need any special tools to install this?
For most vehicles, you will only need basic hand tools like a socket set and a trim removal tool to access the BCM. No programming tools are required for installation.
What if my airbag light is on after I install the BCM?
This can happen occasionally. It means the new BCM needs to be electronically ‘introduced’ to the airbag module (SDM). This is a simple procedure called ‘Setup SDM Primary Key in BCM’ that can be performed by a repair shop with a professional diagnostic tool.
Do you keep my old BCM?
No. We always return your original module along with the programmed replacement unit. We do not keep customer cores.